chore(tooling): add nix flake and reconfigure some stuff for neovim

.vscode/launch.json

@@ -1,15 +1,11 @@
 {
-    // Use IntelliSense to learn about possible attributes.
-    // Hover to view descriptions of existing attributes.
-    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
-    "version": "0.2.0",
-    "configurations": [
-        {
-            "name": "C#: Looking Glass",
-            "type": "dotnet",
-            "request": "launch",
-            "projectPath": "${workspaceFolder}/LookingGlass.csproj"
-        }
-
-    ]
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "C#: Looking Glass",
+      "type": "coreclr",
+      "request": "launch",
+      "program": "./bin/Debug/net9.0/LookingGlass.dll"
+    }
+  ]
 }